/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.tradefed.testtype;

import com.android.ddmlib.Log.LogLevel;
import com.android.ddmlib.testrunner.TestIdentifier;
import com.android.tradefed.config.Option;
import com.android.tradefed.device.DeviceNotAvailableException;
import com.android.tradefed.device.DeviceUnresponsiveException;
import com.android.tradefed.log.LogUtil.CLog;
import com.android.tradefed.result.ITestInvocationListener;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

/**
 * No-op empty test implementation.
 */
public class StubTest implements IShardableTest {

    @Option(
            name = "num-shards",
            description = "Shard this test into given number of separately runnable chunks")
    private int mNumShards = 1;

    @Option(
        name = "test-throw-runtime",
        description =
                "test option to force the stub test to throw a runtime exception."
                        + "Used for testing."
    )
    private boolean mThrowRuntime = false;

    @Option(
        name = "test-throw-not-available",
        description =
                "test option to force the stub test to throw a DeviceNotAvailable "
                        + "exception. Used for testing."
    )
    private boolean mThrowNotAvailable = false;

    @Option(
        name = "test-throw-unresponsive",
        description =
                "test option to force the stub test to throw a DeviceUnresponsive "
                        + "exception. Used for testing."
    )
    private boolean mThrowUnresponsive = false;

    @Option(
        name = "run-a-test",
        description =
                "Test option to make the stub test trigger some test callbacks on the invocation."
    )
    private boolean mRunTest = false;

    /**
     * {@inheritDoc}
     */
    @Override
    public void run(ITestInvocationListener listener) throws DeviceNotAvailableException {
        if (mThrowRuntime) {
            throw new RuntimeException("StubTest RuntimeException");
        }
        if (mThrowNotAvailable) {
            throw new DeviceNotAvailableException("StubTest DeviceNotAvailableException", "serial");
        }
        if (mThrowUnresponsive) {
            throw new DeviceUnresponsiveException("StubTest DeviceUnresponsiveException", "serial");
        }
        if (!mRunTest) {
            CLog.i("nothing to test!");
        } else {
            listener.testRunStarted("TestStub", 1);
            TestIdentifier testId = new TestIdentifier("StubTest", "StubMethod");
            listener.testStarted(testId);
            listener.testEnded(testId, Collections.emptyMap());
            listener.testRunEnded(500, Collections.emptyMap());
        }
    }

    @Override
    public Collection<IRemoteTest> split() {
        if (mNumShards > 1) {
            List<IRemoteTest> shards = new ArrayList<IRemoteTest>(mNumShards);
            for (int i=0; i < mNumShards; i++) {
                shards.add(new StubTest());
            }
            CLog.logAndDisplay(
                    LogLevel.INFO, "splitting into %d shards", mNumShards);
            return shards;
        }
        return null;
    }
}